Over the last few days , I have noticed this leafy green algea starting to grow from the top rocks closest to the light. The algea almost has the shape of a fern leaf .The area where they are growing is a high flow area. It appears to pop up everywhere on the LR.

Apollo - Viper is 100% correct. I was a MASTER at growing bryopsis at a stage. Not that this was a good thing at all....

High alkalinity (around 14 dKh) is not overtly bad for any other lifestock, unless your calcium levels (the possible negative effect of high alkalinity) drop too much....
Raised magnesium definitely works - this feeds the bryopsis TOO much magnesium (which they thrive on), which in fact causes the bryopsis to "burn" itself out (it increases the metabolism of the chloroplast cells in producing energy)....
The bryopsis become lighter and lighter, and then later on "just dissappears".

Hi Apollo - yes - you can indeed use Sodium Bicarbonate to raise the alkalinity in the tank.
For your 60 litre tank, I would suggest adding +-5grams (a teaspoon full - not heaped) every 2nd day - and then measure BEFORE and a minimum 2 hours after dosing - to ensure that your alkalinity does not shoot sky-high.... repeat every 2nd day, until you have reached the target alkalinity.